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Aspiration et démouillage de membranes poreuses

Abstract : The main goal of this thesis is to study the wetting and dewetting of porous substrates coupled to imbibition phenomena. If the imbibition is spontaneous, the flow J of aspirated liquid varies over time. For simplicity, we impose, by pumping, a flow J constant in time, which we will vary over several decades. At first, we studied the behavior of drops on porous membranes. Unlike previous studies, which focused on spontaneous absorption, we sucked these drops through the membrane. Once deposited, the aspirated drop takes the form of a spherical cap. Because of the hysteresis of the membrane, the edges of the drop remain trapped: the radius is constant (stuck regime). The contact angle decreases until it is equal to the back angle. At this moment, the line of contact is unhooked and the radius decreases until total disappearance of the drop (decoupled regime). The kinetics are interpreted simply by writing the conservation of the volume of the drop, whether it is in stuck or decoked regime. In a second time, we were interested in the dewetting of liquid films on these porous membranes. While, on dry membranes without suction, we observe a constant dewetting speed, it is no longer when there is suction film. We make a hole in a film of thickness e
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Laurent Bacri. Aspiration et démouillage de membranes poreuses. Mécanique des fluides [physics.class-ph]. UNIVERSITE PARIS 6, 2000. Français. ⟨tel-01917083⟩

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